A&D Scale HT500GD User Manual

							  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
HT-500GD 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1WMPD4002178 
Jewelry Scale  
						

							 
 1 
SAFETY PRECAUTIONS 
All safety messages are identified by the following, WARNING or 
CAUTION, of ANSI Z535.4 (American National Standard Institute: Product Safety 
Signs and Labels). The meanings are as follows: 
 WARNING A potentially hazardous situation which, if not 
avoided, could result in death or serious injury. 
 CAUTION A potentially hazardous situation which, if not 
avoided, may result in minor or moderate injury. 
  This manual is subject to change without notice at any time to improve the product.   Product specifications are subject to change without any obligation on the part of the 
manufacture. 
  When using the scale, the following safety precautions should always be followed. 
 WARNING 
Repairs 
  Do not disassemble the scale. Contact your local A&D dealer if your 
balance needs service or repair. 
Troubleshooting 
  If a problem has occurred and you cannot clear it, stop using the scale, 
place a notice on the scale and request service from the store where you 
purchased the balance or from your local A&D dealer. 
 CAUTION 
Conditions for use and Ambient Temperature 
 The scale is a precision instrument. Avoid installing the scale in direct 
sunlight, excessive dust, high humidity, high temperature, large temperature 
fluctuations or magnetic fields, which may cause problems or malfunctions. 
  Drafts and vibration may cause excessive weighing errors.   Use the scale range of the -10°C to 40°C, with less than 85% R.H. 
Operation 
  Avoid using the weighing pan to move the scale, as that could cause 
damage to the scale. 
  Avoid overloading that could cause damage to the scale.   The scale is not waterproof type. Water invading into the scale may cause 
damage. 
  If the scale is not to be used for a long period of time, remove all batteries 
from the battery compartment to avoid battery leakage. 
  Do not mix batteries made by different manufactures, or mix old and new 
batteries. Replace all of the batteries at one time. 
  Use only the specified AC adapter for the scale (AC adapter is optional).  
						

							 
 2 Compliance with FCC rules   Please note that this equipment generates, uses and can radiate radio 
frequency energy. This equipment has been tested and has been found to 
comply with the limits of a Class A computing device pursuant to Subpart J 
of Part 15 of FCC rules. These rules are designed to provide reasonable 
protection against interference when the equipment is operated in a 
commercial environment. If this unit is operated in a residential area it may 
cause some interference and under these circumstances the user would be 
required to take, at his own expense, whatever measures are necessary to 
eliminate the interference. (
FCC = Federal Communications Commission in the U.S.A.) 
 
 
 
PARTS DESCRIPTION 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Battery indicator
Weighing units
ZERO indicator 
STABLE indicator 
NET indicator 
Negative sign 
Stainless steel 
weighing pan
Color bar
Display 
ON/OFF key 
RE-ZERO key
UNITS key 
Weighing pan
Calibration switch 
						

							 
 3  
 The  ON/OFF   key turns the scale power on/off. 
 The 
 RE-ZERO   key sets the display to zero or subtracts the weight of a container in the weighing mode. 
The  RE-ZERO   key selects a parameter in the preset modes. 
 The  UNITS   key changes weighing units in the weighing mode. The  UNITS   key selects item in the preset modes. 
STABLE  The STABLE indicator   indicates when the reading is stable in the 
weighing mode. 
The STABLE indicator 
  indicates active units in unit selection. 
NET  The NET   indicates when the net weight is displayed. 
ZERO  The ZERO   indicates when the scale zero is correct. 
 Battery remaining level, shown after power-on only.  
 
Errors  Overload.   The scale zero is out of range.   Low battery. Replace used batteries with four new ones immediately.   Calibration error. The weighing of zero or calibration mass is out of range. 
 
 
 
PREPARATION 
Installing batteries 
St ep 1  Remove the battery cover.   
St ep 2  Before use, remove the insulation tape from the battery compartment. 
St ep 3  Insert 4 new batteries (AA size) into the battery compartment, taking 
extreme care of the polarities.   
St ep 4  Replace the battery cover. 
 
Note  The batteries provided with 
the scale are for testing the 
performance of the scale 
and may have a limited life. 
 
 
St ep 2
St ep 14 new batteries
Battery cover
Insulation tape 
						

							 
 4 
When using the AC adapter 
St ep 1  Verify that the AC adapter is correct.   
St ep 2  Open the rubber cap and plug the AC 
adapter into the AC adapter jack. 
 
 
 
 
 
 
WEIGHING 
St ep 1 Turning the scale on / off 
 Press the  ON/OFF   key to turn the scale on.   The scale displays all segments for a few seconds and then displays zero. 
Press the  ON/OFF   key again to turn the scale off.  St ep 2 Selecting the weighing unit 
 Press the  UNITS   key to select the weighing unit.   The scale will power up with the weighing unit that was in use when last 
turned off. 
 
St ep 3 Weighing   Verify that the reading is zero. If not, press the  RE-ZERO   key to zero the display.     If you use a container for weighing, place an empty container on the 
weighing pan and press the  RE-ZERO   key to zero the display.   Place the objects to be weighed on the weighing pan or in the container. 
When the reading becomes stable, the STABLE indicator  is displayed. 
 
 
 
St ep 2
AC adapter jack
Rubber cap 
						

							 
 5 
FUNCTIONS 
Automatic Power Off Function If the scale is left ON and the STABLE indicator is displayed, the automatic 
power-off function turns power off after approximately 5 minutes. 
St ep 1 Entering the preset mode. 
Press the  ON/OFF   key while pressing the  RE-ZERO  key. 
St ep 2 Selecting the status. 
Press the  RE-ZERO   key to disable or enable this function.    Automatic power off function is disabled    Automatic power off function is enabled. 
St ep 3 Storing the status. 
Press the  UNITS  key. The scale displays   and returns to the weighing mode. 
 
 
 
Storing Weighing Units   Among the units, those available for the user have been set at the factory 
before shipping. The unit can be selected in the preset mode. Refer to the 
table on the page 6 for the order of the units available, while skipping the units 
that are not available. Select and store the weighing units as described below. 
  It is also possible to specify the display unit that will be shown first when 
the scale is turned on. 
  Either Tael (HK general, Singapore) or Tael (Taiwan) can be selected. 
St ep 1 Entering the preset mode. 
Press the  ON/OFF   key while pressing the  UNITS  key. Press the  RE-ZERO  key. 
St ep 2 Selecting units.  UNITS   key  Select the unit.    RE-ZERO   key  The STABLE indicator   indicates when to enable the unit. Select to disable or to enable the unit. 
ex.  or  . 
St ep 3 Storing units. 
Press the  UNITS  key to display  . Press the  RE-ZERO   key to return to the weighing mode.   
						

							 
 6 Unit  Unit name  Conversion to gram At preset mode
 Gram 1 g  
 Tola (India)  11.6638038 g   Ounce (Avoir)  28.349523125 g 
 Troy Ounce  31.1034768 g   Pound (UK)  453.59237 g  Tael (Taiwan)  37.5 g   
Ta el ( HK general, Singapore)   3 7.79 94 g   
 Pennyweight 1.55517384 g   Metric Carat  0.2 g  
 Newton   is a value calculated as follows:   
  Newton = (weight in gram) x (9.80665 m/s2) / 1000.   
 
 
 
Selecting The Decimal Point St ep 1 Entering the preset mode. 
Press the  ON/OFF   key while pressing the  UNITS  key. Press the  UNITS   key to display the current decimal point.    or . 
St ep 2 Selecting a decimal point. 
Press the  RE-ZERO   key to select decimal point    or . 
St ep 3 Storing the decimal point. 
Press the  UNITS  key to display  . Press the  RE-ZERO   key to return to the weighing mode.  
 
 
Setting The Stability St ep 1 Entering the preset mode. 
Press the  ON/OFF   key while pressing the  UNITS  key. Press the  UNITS   key to display the current setting.  or . 
St ep 2 Selecting a filter. 
Press the  RE-ZERO   key to select  or   for the filter response. 
St ep 3 Storing the selected filter response. 
Press the  UNITS  key to display  . Press the  RE-ZERO   key to return to the weighing mode.  
						

							 
 7 
CALIBRATION 
When is Calibration Required? Calibration may be required when 
the scale was initially installed or has 
been moved to another location. 
 
 
 
 
Calibration Using a Calibration Weight 
St ep 1 Entering the calibration mode 
  Remove the switch cover located on the bottom of the scale. 
 Press the 
 ON/OFF   key to turn the scale on.  Press the  Calibration   switch while the scale is in the weighing mode.  will be displayed.  
St ep 2 Zero calibration 
 Press the  RE-ZERO  key.   will be displayed.   Wait for the STABLE indicator   to be displayed with nothing on the 
weighing pan.   
Press the 
 RE-ZERO   key to perform zero calibration.      will be displayed after a few seconds.   
Select next step as follows:   
 Proceed to the span calibration of St e p 3.  Press the  UNITS   key to return to the weighing mode without performing span calibration. 
St ep 3 Span calibration 
 When   is displayed, place the calibration weight on the center of 
the weighing pan.   
Wait for the STABLE indicator 
 to be displayed.  
Press the  RE-ZERO   key to perform span calibration.     will be displayed and the scale will automatically return to the 
weighing mode. 
Remove the calibration weight from the weighing pan. 
Note  For details about the calibration weight, Refer to SPECIFICATIONS.  
 
 
St ep 1
Switch cove
r
Calibration switch 
						

							 
 8 
Calibration by Gravity Compensation If the acceleration of gravity at your location is not correct and you do not have 
calibration weights, the scale can be calibrated by compensating for the 
acceleration of gravity. Refer to The Value of Gravity at Various Locations. 
St ep 1 Setting a new acceleration value 
 Press the  ON/OFF   key to turn the scale on.  Press the  Calibration   switch while the scale is in the weighing mode. Press the  UNITS  key when   is displayed. The current acceleration value will be displayed.    ex.  . 
Change the value with following keys. 
 RE-ZERO  key   Increments the blinking digit.  UNITS   key  Moves the blinking digit. 
St ep 2 Storing the value into the memory 
  While pressing the  UNITS   key, press and hold the  RE-ZERO  key and release the  UNITS  key. After  ,  will be displayed.  
Turn the scale off to finish the procedure. 
 
 
SPECIFICATIONS 
MODEL HT-500GD Weighing capacity 510 g Resolution 0.1 g Non-linearity ±0.2 g Repeatability (Std. deviation)0.1 g Span drift ±150 ppm/°C    (5°C to 35°C / 41°F to 95°F) Operating temp. -10°C to 40°C / 14°F to 104°F, Less than 85%RH Display 13.5 mm / 0.53 inches, 7segment liquid crystal displayDisplay update Approximately 10 times per second Power supply 4 x R6P / LR6 / AA size batteries or AC adapter Battery life Approximately 450 hours with alkaline cells at 20°C / 68°FPan size 132 (W) x 130 (D) mm  5.2 (W) x 5.1 (D) in. Dimensions 195 (W) x 136 (D) x 44 (H) mm  7.7 (W) x 5.4 (D) x 1.7 (H) in.Approximately weight 610 g Max. Tare weight 510 g Calibration weight 500 g ±0.01 g 
Accessories 3 color bars, stainless steel weighing pan,   
this manual, 4 AA size monitor batteries 
Options AC adapter   
						

							 
 9 
Gravity Acceleration At Various Locations  
Amsterdam 9.813 m/s2 Madrid  9.800 m/s2 Athens 9.807 m/s2 Manila  9.784 m/s2 Auckland NZ  9.799 m/s2 Mexico City  9.779 m/s2 Bangkok 9.783 m/s2 New York  9.802 m/s2 Brussels 9.811 m/s2 Milan  9.806 m/s2 Buenos Aires  9.797  m/s2 Oslo  9.819 m/s2 Calcutta 9.788 m/s2 Ottawa  9.806 m/s2 Cape Town  9.796 m/s2 Paris  9.809 m/s2 Chicago 9.803 m/s2  Rio de Janeiro  9.788 m/s2 Copenhagen 9.815 m/s2 Rome  9.803 m/s2 Nicosia 9.797 m/s2  San Francisco  9.800 m/s2 Jakarta 9.781 m/s2 Singapore  9.781 m/s2 Frankfurt 9.810 m/s2 Stockholm  9.818 m/s2 Istanbul 9.808 m/s2 Sydney  9.797 m/s2 Havana 9.788 m/s2 Taipei  9.790 m/s2 Helsinki 9.819 m/s2 Tokyo  9.798 m/s2 Kuwait 9.793 m/s2 Vancouver, BC  9.809 m/s2 Lisbon 9.801 m/s2 Washington DC  9.801 m/s2 London (Greenwich)  9.812 m/s2 Wellington NZ  9.803 m/s2 Los Angeles  9.796  m/s2 Zurich  9.807 m/s2  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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Business Park, Abingdon, Oxon    OX14 1DY 
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